Wow. Two thoughts immediately come to mind:
1 - Seek some competent legal advice. Don't be a fucking moron: You're about to lose your job and reputation and maybe be sued out of existence and your biggest worry is to "avoid incurring the cost of a lawyer"? So you come to slashdot instead? Mindboggling. Maybe some other competent professional advice as well?
2 - Sounds like too many coincidences to convince a jury. To prove you've been framed you would have to find out who did it and how they benefited doing it or you'll just sound like your garden variety disgruntled employee / asshole too clever for is own good or something like that. If I were you I'd start looking for another job.